Any
laptop built-in webcam
should work. An external webcam should be 640x480 resolution, however
1.3MP is
better. Here are webcams available at
amazon.com, geeks.com,
and
newegg.com.
Note:
some
webcams
include separate microphone headsets.

Headphone/Microphone
Headset

A
headset is highly recommended,
especially if using a built-in webcam. Some of the nicer external
webcams have decent mics, but still pick up ambient noise. Here
are headsets
available
at
amazon.com and newegg.com.